First is problem with narration and mostly it's a lack of focus. This seems to be rather common among kids, but frustrating for me. She can comprehend, but it seems like she picks and chooses what she wants to comprehend. It's really frustrating! Plus she can get her bible verses memorized in 2-3 days, so it' doesn't make sense to me. She drifts and I try to catch her at it..... then starts saying something that has nothing to do with the subject at hand.
Second, when we ask questions at the end of Early Reader's Bible or any question, EVERY answer is so vague. It's "good" or "bad" or "doing good things". I entice her to say more, but maybe someone has something great to say that works that I'm not using.
And this is a big issue with us. Here's an example: We were doing an Assessment in our LLATL today and the question was: Tell me two words to describe a cat. Her first answer. "The cat is happy". My response was I don't want a sentence, just two words that describes a cat. Then I said we have a cat, Millie. Describe her. Then she says, "one, two".
What the heck? But then I asked to to describe what she was wearing and she did. She said a sweater and a dress. Example two: How do you begin a person's name? (no answer) I said, When you write, how do you begin a person's name? (answer: capital letter) her answer, "First name is Sara".
WHAT THE HECK?She can carry on a conversation like an adult, but sometimes you ask a question and you want to pull your hair out! I'm guessing this is from the lack of being in an atmosphere of question/answer sort of thing? You know, school? Anyone have this problem?
No real advice but just wanted to encourage you to stick with it. You will get results eventually and it is worth it. One thing I found that really helped with my kids was to model narration with them. Meaning I would read something and show them how to narrate. It is a skill that has to be learned. I think it takes time. Also realize the not having the skill yet does not mean they are ignoring you necessarily. Another thing to be sure of is that you are not dealing with a fear factor that they may feel that whatever they say may not be good enough. Mine actually had a fear that came from a bible study we tried to do with a neighbor kid. They felt "stupid" around him so they stopped answering questions on comprehension. They would answer the same thing "good" etc. even if that did not make sense. I finally got it out of them and was able to explain that the narration was not a test but a way to help them remember and it is supposed to be fun. Solved it all and eventually they got pretty good at it. 
They are saying exactly the same things I would say to your questions. So, I'll just pop in and agree that the visual vs. auditory thing is HUGE in some children's ability to comprehend what you're asking them to do.